Memory effects on scale-free dynamics in foraging Drosophila
Memory effects on scale-free dynamics in foraging Drosophila
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DOI：
10.1016/j.jtbi.2009.06.018
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发表时间：
2009-10-07
影响因子：
2
通讯作者：
Shimada, Ichiro
中科院分区：
文献类型：
--
作者：
Koganezawa, Masayuki;Hara, Hiroaki;Shimada, Ichiro
果蝇（Drosophila melanogaster）在觅食中表现出无标度行为，即在食物上的停留时间呈现幂律分布。通常认为标度指数是稳定的，并且指数本身对于无标度行为的重要性仍然难以捉摸。我们提出了一个模型，其中动物无标度行为的标度指数取决于个体的记忆。所提出的模型基于动物行为与动物内部状态相关的前提。标度指数的变化是通过将丢失记忆视为不确定性增加而得出的，不确定性以内部状态的信息熵表示。预测的模型行为与野生型和学习/记忆果蝇突变体觅食行为的实验结果一致。由于内存量而导致缩放指数变化的概念为无标度行为的出现和缩放指数的含义提供了新颖的见解。 (C) 2009 Elsevier Ltd. 保留所有权利。
The fruit fly, Drosophila melanogaster, displays a scale-free behavior in foraging, i.e., the dwell time on food exhibits a power law distribution. The scaling exponent is generally believed to be stable and the significance of the exponent itself with respect to the scale-free behavior remains elusive. We propose a model where by the scaling exponent of the scale-free behavior of an animal depends on the memory of the individual. The proposed model is based on the premise that animal behaviors are associated with internal states of the animal. The changes in the scaling exponent are derived by considering losing memory as increasing uncertainty, which is expressed in terms of information entropy of the internal states. Predicted model behaviors agree with experimental results of foraging behavior in wild-type and learning/memory Drosophila mutants. The concept of changes in the scaling exponent due to the amount of memory provides a novel insight into the emergence of a scale-free behavior and the meaning of the scaling exponent. (C) 2009 Elsevier Ltd. All rights reserved.